Circular sawing machine



(No Model.) 2 Sheets-Sheet 1. J. H. PALM.

ACIRCULAR SAWING MACHINE. No. 345.0%() Patented July 6,.' 1886.

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(No Modem 2 sheets sheet 2.

- J. H. PALM.

CIRCULAR SAWINC MACHINE.

Patented July 6, 1886.

WW M www RN MM UNITED STATES PATENT CIRCULAR SAW ING MACHINE.

SPECIFICATION forming part of Letters Patent No. 345,070, :lated July 6, 1886.

Application filed October 27. 1885.

To @ZZ whom it may concern:

Be it known that I, JOHN HIsKEY PALu, a citizen of the United States, and a resident of Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Sawing-Machines, of which the following is a specification.

kThis invention relates to that class of sawing-machines in which the table and frame are stationary and the saw adapted to be moved through the lumber and it consists in the construction, combination, and arrangement of parts. as hereinafter shown and described, and then specifically defined by the claims. Y

In the drawings, Figure l isa side elevation of the saw-frame complete. Fig. 2 is a crosssection on the line x x of Fig. l. Fig. 3 is a rear elevation of the saw-frame complete. Fig. 4 is a sectional elevation of the upper part of the machine on the line y y of Fig. 3. Fig. 5 is a plan view in section on the line z z of Fig. 4.

A represents the main frame, to the upper side of which the saw-table A2 is hinged by one end at a, while the other end is adjustably connected to the frame A by a bracket, A, and set-screw b, so that the inclination of the table may be adjusted as required.

C represents a rest attached across the table. A, against which the lumber is supported while being cut.

Beneath the table A'Z the frame A is formed with two parallel and horizontal members, A4 A5, on which a saw mandrel frame, B', is adapted to slide. The outer upper edges of the members A4 A5 are formed undercut, and the outer'lower edges of theframe B provided with correspondingly. undercut lips or ribs o c2, embracing the edges of the members AL and A5, so that while frame B is free to slide back and forth along said members A4 A5 it will not be lifted up therefrom. The ribs c c2 will be provided with adjustable gibs c3 c5, adapted to fit in beneath the undercut edges of the members AAL and A5,to take up any wear of the members A4 A5 or frame B, and thus keep the parts in true 'running order.

B2 represents the saw-mandrel, journaled across the frame B,and having a driving-pulley, B5, on one end and the saw B* on the Serial No. 181,110. (No model.) b

` other end, the latter adapted to project up above one edge of the table A2, as shown.

Journaled across the upper end of the frame A', opposite to the rest C and above the table 55 A^",is a shaft, D, carrying a chain or sprocket wheel, Du, on one end outside the frame A', and with a friction drum or pulley, D5, between the sides of the frame, as shown. Beneath this drum Don a shaft, Dt, is another 6o friction-drum, D5, the-two friction-drums running in contact, and the upper drum, D5, adapted to be adjusted higher or lower to reg` ulate the friction by set-screws d d2, acting upon the adjustable bearings e c, by which the ends of the shaft D are journalcd to the frame A.

D6 is a third shaft, journaled by its ends in adjustable bearings g g2 on the frame A', and carrying a third friction-drum, DI. Theends 7c of the shaft D, which are inserted into the bearings g g2, are eccentric to thc main part ofthe shaft D5, so that when the shaft is revolved a partial revolution the drum D7 will be raised and lowered to a limited extent. l The shaft D6 is'loosc in the drum DI, and is provided with a'lever-arm, D8, connected at its outer end by a rod, D, to one end of a treadle, D10, the latter being pivoted at h to the lower part of the frame A', and project- 8o ing out in front of the frame, and provided with a foot-board, 7i?, convenient to the foot of the operator. By pressing down upon the foot lever or treadle D10 the arm D8 will be moved upward and revolve the shaft D5, and by its eccentric connection in the bearings y g'z this action will move the drum D7 upward.

E is a flat plate connected at one end, t', to the saw mandrel frame B,'and extendingv backward and lying loosely across the drum 9o D7 and beneath the drum D5. The plate E is not in contact with the roller D5 (which, as before stated, is constantly revolving) when the foot-board end ,h5 of the treadle Dlo is elcvated and the arm D8 depressed; but when-95 the roller D6 is elevated, as before stated, by the action of the treadle and eccentric-shaft D5, the plate E is pressed up against the roller D5, and is thereby set in motion, and the saw-frame B moved along the members A4A5. roo

Journaled in bearings m m2, across the lower part of the frame A', beneath the shafts D D* D5, is the main driving-shaft F', having the loose and tight driving-pulleys F2 F3 on one end, and a sprocket-pinion, F, on the other end, the latter adapted to carry an endless chain, F5, by which the motion of the shaft F is communicated to the sprocket-wheel D, and thence to the drums D3 and D5. The bearing m2 is provided with collars, (concentric to the shaft F, and projecting from its ends,) on which a yoke-frame, G', is mounted, as shown, the latter having journaled in its upper end a shaft, G5, carrying a pulley, G5,

on one end, connected by a belt, G, to a pulley, G5,on the shaft F', and carrying a pulley, G5,on its other end, connected by a belt, G7, to the saw-driving pulley B5. meut t-he motion of the main shaft F' is communicated to the shafts D' D, and also to the saw-mandrel B2. The upper end of the yokeframe G is connected to the saw mandrel frame B' by a rod, H', the latter adjustable by a screw-connection, H", so that the tension of the belt G7 may be maintained at all times, and increased or decreased, as desired. j

The upper surface of the plate E will be faced with rubber, leather, or other similar suitable substance, so that the roller D5 will not slip upon it. On the under side of the table Az a brush, K, is secured and adapted to rest in Contact with the plate E', to brush therefrom any adhering sawdust or other foreign matter and prevent its passing beneath the drum D5. I

L' is a spring connecting the main frame A' and the saw-frame B', sothat the latter will be returned to its normal position when the treadle D10 is released; and L2 represents a similar spring connecting the free end yof the yoke-frame G' with the main frame A', to assist in drawing the yoke-frame forward when the saw is in operation, to prevent all the strain coming upon the belt and tension-rod'H'. One end of each of these springs will be adjustable by a windlass or drum, L3 and L, respectively, to regulate their power.

The yoke-frame G' is formed in two parts adjustable cndwise by a set-screw, n, and held by bolts n, so that the yoke-frame may be lengthened or shortened to. regulate the tension of the belt G5. As before stated, the yoke-frame is mounted by its lower end on collars non the bearing m2, and concentric to the shaft F', whereby the yoke-frame moves about the shaft By this arrange- F' as a center, whileat the same time it is not in contact with the shaft; hence the friction of the' constantly-revolving shaft is not borne in any manner by the yoke-frame.

An adjustable tightener, F7, will be attached to the frame A' at any suitable point, to run in contact with the endless chain F5 and regulate its tension.

The frame B' will be provided with oil-cavities t' t", by which the lower surface of the frame B and the upper surfaces of the members A4 A5 may be lubricated. Y

Having thus described my invention, what I claim as new is- 1. In a sawing-machine, the combination of a main frame, A', having an adjustable table, A, frame B', carrying saw-mandrel B2 and saw B5, and provided with horizontal plate E', constantly-revolving friction-rollers D3 D5 above said plate, eccentrically-mounted fric tion-roller D7 beneath said plate, and adapted to be elevated and depressed by foot-treadle D1, main driving-shaft F', carrying pulley G5, and sprocket-pinion F, yoke frame G', mount ed concentrically by its lower end to said shaft F', and carrying shaft Gq and pulleys G3 G5 upon its upper end, belt G", connecting said pulley G6 to said saw-mandrel B5, adjustable tension-rod H' H", connecting said yokeframe and said saw-mandrel frame, and an endless chain, F5, communicating motion from said shaft .F' to said friction-drums D3 D5, substantially as set forth.

2. In a sawing-machine, the combination of `a main frame, A', adjustable t-able A5frame B', carrying a saw-mandrel and saw, horizontal plate E', connected by one end to said frame B', and resting across eccentrically-mounted drum Dl, constantly-revolving drums Da D5 above said horizontal plate, means for elevating said drum Dl` to cause said plate E to be brought into contact with said constantly-revolving drum D5, whereby said saw-frame B' is moved along beneath said table A, and a Xed brush, K, in contact with the upper su rfaee of said plate E', substantially as set forth. In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN HISKEY PALM. Witnesses:

FREDK. B. LATHROP, W. F. ADAMsoN.

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